Although the BC for the two-component linear-in-moment model has been derived many times
before [1]}, [2]}, [3]}, [4]}, [5]}, [6]}, [7]}, [8]}, [9]}, [10]},
here, we rederive it following the “standardized” procedure and form of Ref. Ahari
and provide details to emphasize the important points of the formalism.
Also, for pedagogical purposes, we demonstrate the derivation of the current-conservation principle itself from the norm-conservation principle,
and emphasize the point that BCs are essentially a way of specifying admissible Hilbert spaces over which the Hamiltonian becomes hermitian.
